Propagating New Plants from Root Cuttings
Wait until the leaves have turned brown and the oriental poppy is fully dormant to start this process. Then rake the soil away from the crown of the plant to expose the fleshy roots. Use sharp pruners or a knife to cut just a few pencil size roots. Rake the soil back over to cover the remaining roots.
Cut each harvested root into 2 to 3 inch sections. Plant the root sections horizontally in a flat of moist peat moss and sand. Cover the flat with plastic to keep the mix moist and place in shaded location.
Shoots will eventually appear. Move to a larger container and water thoroughly. Grow in a protected site until plants are well rooted. Harden off and plant in their permanent location in the garden.
A bit more information: Try this technique on other fleshy root perennials. Bear’s breeches, butterfly weed, Japanese anemone, sea holly and pasque flower are just a few. See the University of Washington’s publication on various ways to propagate specific perennials.